Intermittent inductive train-control system



March 3, W33 w. H. REICHARD 1,794,547

INTERMITTENT INDUCTIVE TRAIN CONTROL SYSTEM Filed July 15. 1929,gQATToRm-w Patented Mar. 3, 1931 I STATES PATENT OFICE WADE, H.REICHARD, or ROCHESTER, mw oak; ASSIGNOR 'ro- GENERAL RAILWAY 7 sIeNAr.coMrANY, or nocHEsrnannwYoRK INTERMITTE'NT innuorrvn TRAIN-CONTROLSYSTEM Application filed aui is; 1929, Serial No. 378,322.

This invention relates in'general to intermittent inductive traincontrol systems, and has more particular reference to an improvedtrackw'ay inductor immune from false clears due to a short or the like,useable in such systems. 7 i p r In systems of the character inquestion, such for example as shownin application 358,577 filed April27, 1929, by W. H. Reich- 10 'ard, a wayside inductor, controlled inaccordance with tr'aflic conditions ahead, is transiently COUPlQdWltll acar-carried receiver so asto influence such recelver and secondarycircuits conne'ctedtherewith to exert desired controls on the train,

' Obviously,'it is desirableto make the inductor as far immune aspossible tosetting up proceed conditions due to false conditionof theinductor.

is proposed, in accordance with this invention, to provide an inductorhaving two main windings, soarranged and connected'up as to make itpractically impossible for it to have effect onthe receiver unlessclearconditions exist on the track-way. 7

Further objects, purposes and characteristic features will appear asthedescription progresses, reference beingmade to the ac- 30 companymgdrawing showing, in aiwholly A' diagrammatic manner, one embodiment ofapplicants invention. 1 v I gInthe drawingz I The single figure ofdrawing is-a diagrammatic view of one form of applicants inven tion asemployed'in atrain control system."

Referring now to the drawing, 1 there: is

shown a stretch of railway track constituted bytrack rails 1, dividedinto usualsignal blocks byinsulating joints 2,-with a wayside signal 3at the entrance end of each block, controlled in; any usual-or desiredmanner (not shown on the drawing) andoperating, inoany usual manner, acontact finger 5', to

different positions, depending oni-tra ffic conditions.

Carried on a car, represented diagrammati-,

cally by wheelsand axles 7 isa receiver constituted by alaminated'coreGo in the general formof an The receiver and associatedWith the above and other objectsin view,it

circuits are substantially-the same as'shown in the above referred toReichard application.

vCarried on the core C0 are two primary windings P, and two secondarywindings S, the two primary windings P being connected in series witheach other and with a tuning condenser 8, across a source of alternatingcurrent, suchas an alternator 9. The two secondary windings S are,likewise, connected in series with each other and witha tuning cons-o:denser 10, and across a brake applying device EPV, whichcan'be of anyusualior desired form and whichzisinormally energized and operates,when-de-energized, to exert any de sired control such, for example, asgiving an automatic brake application.

Located at the entrance end of each signal block, 'atthe signallocation, isan inductor, shown in the particular exampleto bepositionedbetween th'etrack rails 1, and comprising a laminated magnetic core Gr,carrying two spaced'control windings W' and VVF, with a condenser 11bridged across winding W,

and acon-denser 12 bridgedacross winding The controlo f the inductor onthe receiver when the receiver passes over the inductor, is similar tothat explained in detail in the above referred to Reichard. application.Briefly,-under clear or safe conditions, at

which time contact 5, is in its or circuit closing position, each of thewindings V and M on the inductor exerts a clearing effect onthereceiver, so to not reduce the current normally energizing the deviceEPV to an extent suflicie'nt to cause it to release and apply thebrakes. Under caution and danger conditions, however, contact 5 is incircuitopening position, to'thereby. open the v circuit fdbOVe referredto as including the 13, are so chosen that each winding, when it i hasbridged across it the other winding and the capacitator 13 in series, isin a circuit having the proper characteristics to exert such'a chokingeiiect on the core C?" that the core does not materially disturb thenormal inductive relationship o-fthe primary and sec ondary windings onthe receiver. Inthis manner, the receiver is practically unaffected bythe inductor.

If, however, either of'the windings V or W has bridged acrossitonly theother winding, or only the capacit'ator 13,'th e resulting circuit hassuch characteristics as to produce a stopping effect on the receiver.This is most likely due to the said circuit permitting a material amountof flux to pass through the core Cr and to thus disturb the normalrelationship between the primary and secondary windings on the receiverso that bucking fluxes through the secondaries produce little or nosecondary voltages. a

The condensers 11 and 12, which are bridged-across the windings W andVVrespectively, are optional, but are preferably employed since: theyserve to increase the ratio of EPV current under clear conditions to theEPV current uncer caution and danger conditions.

These two condensers 11 and 12, can, if desired, be replaced by a singlecondenser, po sitioned outside o-fthe inductor casing, and connected inmultiple with condenser 13 but shunted around linger 5, instead ofinseries with 5, as is condenser 13.

From the abovediscussion, it should be clear that each winding on thei-nductoris changed from having a stopping effect when simply bridged by11 or 12, to having a clearing effect, by bridging across it aninductance constituted by the other winding, and a capacitanceconstituted by the condenser 13,

and that neitherwinding W nor V is changed from having a stoppingeflect, 'to

- shunted out.

ing elfect on the receiver, since both its normal inductance N andcapacitance 13 are Under these same conditions however, winding VV hasbridged across it the condenser 13 but not the winding W and hence thiswinding W has a stopping. in-

winding W produces a stopping effect, while might produce a clearingeffect.

With a cross such as produced by wire 6, hereagain windin-gW' mightproduce a clearing effect on the receiver, but this could do no harmsince the other winding W having its normal inductance \V shunted out,produces a stopping effect. I With a cross such as produced by wire 6 Wgives a stopping 'eliect, while WV might possibly give a clearingeffect.

With a crosssuch as-produced by wire 0,

which shunts o-utthe condenser 13, each ofthe windings V and "haveshunted across it only an inductance in the form of the'other windings,and hence each winding WV and 1V produces a stopping effect.

From the above it is: seen thata; single short circuit in connectionwith the inductor can produce only a stopping inductor, and cana I notset up a false clear influence onthe receiver, such as to permit-passageover the inductor without incurring anautomatic brake application.

. In order to minimize, to the greatest exvention, hasb'e'en givensolely'by way of'illustration, and is not intended, in any mannerwhatsoever, ina limiting sense. Obviously, this invention can assume'many different physical forms, and is susceptible of numerousmodifications, and all such forms and modificationsare desired to beincluded by this invention, as come within the scope of the appendedclaims. i

Having described my invention, I now claim 1. In an inductorfforinductor train control systems, in combination, a core ofnetic'material, two distinct spaced control windings on the core, acondenser, traffic controlled means'forat times bridging across eachcontrol winding, the other control winding and the condenser in series,and "a carcarried receiver, positionedto pass over, and be inductivelyinfluenced by, the inductor, for stopping or not stopping the caraccording as the inductor exerts thereon a stopping or a clearingefi'ect, each control winding being adjusted to exert a clearing effectonly if in series with the other control winding and the condenser.

'2. In aninductor for inductive train control systems, in combination,acore of magnetic material, two separate spaced control windings on thecore, a condenser, traffic controlled means for at times bridging,across each control winding, the other control winding and the condenserin series, and a car-carried receiver, positioned to pass over, and beinductively influenced by each of the control windings by itself forstopping or not stopping the car according as each inductor is not,

or is, in series with the condenser and the other control winding.

8. In an inductor for inductive train control systems, in combination, acore of magnetic-material, two separate spaced control windings onthecore, a condenser, traflic controlled means for at times bridging,across each control winding, the other control winding and the condenserin series and a carcarried receiver, positioned to pass over, and beinductively influenced by, the inductor,

for stopping or not stopping the car according as the inductor exertsthereon a stopping or a clearing effect, each control winding being soadjusted as to separately exert a stopping, or a clearing, effect on thereceiver, only according as it does not, or does, have bridged acrossit, said other control winding and the condenser in series.

4. In an inductor for inductive train control systems, in combination, acore of mag netic material, two spaced control windings on the core, acondenser,.trafiic controlled means for at times bridging, across eachcontrol winding, the other control winding and the condenser in series,and a car-carried receiver, positioned to pass over, and be inductivelyinfluenced by, the inductor for stopping or not stopping the caraccording as the inductor exerts thereon, a stopping or clearing effect,each control winding exerting a stopping, or a clearing, effect on thereceiver,

said control windings and said condenser bee in g so adjusted that thebridging across a control winding of the other control winding only, orthe condenser'only,produces a stoppingeffect on the receiver.

5. Inan inductor for inductive train control systems, in combination, acore of magnetic material, two spaced control windingson the core, acondenser, .traiiic controlled means for at times bridging across eachcontrol w ndlng, the other control winding and the condenser in series,and a car carried receiver, positioned to pass over, and be induc-'tively influenced by,'the inductor, for stopping or not stopping the caraccording as the inductor exerts thereon a stopping or a clearingefiect, each control winding exerting a stopping, or a clearing, effectonjthe receiver,

according as it does not, or does, have bridged across-it, saidothercontrol winding and the condenser in series, said control windings andsaid condenser being so adjusted that the bridging across a controlwinding of the other control winding only, or the condenser only,produces a stopping eifect .on the. re-

ceiv'er'. j t j 6. In comb nation'with an lnductor, a car- 'carriedreceiver positioned to inductively pass over the inductor and beinfluenced by exerting a stopping or clearing effect on the receiver,each winding being connectable in circuit with the other winding throughtraffic controlled means and circuit adjusting means, whereby, when notso connected, to

each give astopping effect on the receiver.

8. In combination with an inductor, a carcarried receiver positioned toinductively pass over the inductor and be influenced by the inductor toexert on the car either a clearing, or a stopping effect, the inductorinclud-.

spaced control windings on the core each exerting a stopping or clearingeffect on the receiver, a traffic controlled circuit including thecontrol windings so as to cause each winding to exert a clearing effector a stopping effect according as the circuit is closed or open. I

i '9; In combination with an inductor, .a car- 'carried receiverpositioned to inductively pass over the inductor and be influenced bythe inductor to exert on the car either a clearing, or a stoppingeffect, the inductor includin a core of magnetic material, and twospaced control windings on the core each exerting a stopping or aclearing efiect on the receiver, said control windings being so aring. acore of magnetic material, and two ranged as to make it impossible for asingle cross connection to make both said' 'control windings exert aclearing eflect.

10. In combination with an inductor, a carcarried receiver positioned toinductively pass over the inductor and be influenced by the inductor toexert on the car either a clearing, or a'stopping effect, the inductorincluding a core of magnetic material, and two spacedcontrol windings onthe core each exerting a stopping or a clearing effect on the receiver,a'traffic controlled circuit including thecontrol windings so as tocauseeach Winding toe'xert a vclearing effect or a stopping efl'ect accordlngas the olrcult 1s. closed or openyszvid control -Windings being soarranged asto make it impossible for a single cross connection to makeboth said control windings exert a clearing effect.

In testimony whereof I a'ffix my signature.

WADE H. REIGHAYRD.

